prov/shm: failing fi_multi_recv with dsa testing

[Sean Hefty]

Failing in CI testing:

name:   fi_multi_recv -e rdm -p "shm"
17:38:25    timestamp: 20221026-003825+0000
17:38:25    result: Fail
17:38:25    time:   2
17:38:25    server_cmd: /home/cstbuild/ofi-Install/libfabric/ofi_libfabric/PR-8162/1/reg/bin/fi_multi_recv -e rdm -p "shm"   -s jfcst-pvc3
17:38:25    server_stdout: |
17:38:25      [error] fabtests:functional/multi_recv.c:127: Received 1 completions per buffer, expected 64
17:38:25    client_cmd: /home/cstbuild/ofi-Install/libfabric/ofi_libfabric/PR-8162/1/reg/bin/fi_multi_recv -e rdm -p "shm"   -s jfcst-pvc3 jfcst-pvc3